Yellow coloured ink is mostly used for text correction in Jain manuscripts. The yellow ink was prepared from Hartal (હરતાલ, हरताल) which is claimed to be made from the urine of a cow. This colour is occasionally mixed with white ink and then used for correcting errors.

In Jain tradition the texts were written first by Lahiyas, later these manuscripts were checked by a Muni (Monk). Mistakes in the texts were then corrected with this yellow ink. It was used as a whitener on the off-whitish paper surfaces. At times yellow ink was also used in illustrations and other motifs in the manuscript.